1. Core Concepts

HDMI: A dedicated wired interface for transmitting high-definition audio and video, with high bandwidth (such as HDMI 2.1 supports 48Gbps), but usually requires a short-distance direct connection.
RF Modem: Modulates digital signals onto RF carriers (such as through Wi-Fi, 60GHz and other frequency bands) for wireless transmission, or transmits via coaxial cables/antennas.

2. Possible solutions

Solution 1: Wireless HDMI transmission

Device type: Wireless HDMI transmitter/receiver (such as Nyrius ARIES, Siig wireless HDMI).
Technical principle:
Use 60GHz millimeter wave (uncompressed, low latency, but easily blocked by obstacles).
Wi-Fi 6/6E or 5GHz band (supports compressed transmission, which may reduce image quality).
Application scenario: Wirelessly connect TVs, projectors, and game consoles to avoid wiring.

Solution 2: HDMI over Coax (coaxial transmission)

Device type: HDMI RF modulator + coaxial transmission system (such as TruLink MoCA).
Technical principle:
Modulate HDMI signals to RF carriers and transmit them through coaxial cables or network cables.
A demodulator is required to receive and restore the signal.
Application scenario: Transmit high-definition signals through existing cable TV networks, suitable for long-distance or wired coverage scenarios.

Solution 3: IP network transmission (alternative solution)

Device type: HDMI encoder + streaming media player (such as Teradek, Magewell).
Technical principle:
Convert HDMI signals into IP packets and transmit them via Ethernet or Wi-Fi.

Supports remote access, but depends on network stability.
Application scenario: Streaming media to mobile phones, tablets or remote terminals.

3. Key limiting factors

Bandwidth requirements: HDMI high resolution (such as 4K/8K) has extremely high requirements for transmission technology, and wireless solutions may need to compress or reduce frame rates.
Latency: Wireless transmission may introduce latency, affecting games or real-time video.
Interference: RF signals are easily interfered by other wireless devices or obstacles (especially 2.4GHz/5GHz bands).

4. Typical product examples

Wireless HDMI:

Evertreen 4K 60Hz Wireless Transmitter (60GHz, lossless transmission).
AmazonBasics Wireless HDMI Adapter (based on Wi-Fi, supports compressed 4K).

HDMI over Coax:

Cable Matters HDMI over Coax Extender (transmits 4K 60Hz via coaxial cable).

IP transmission:

Monoprice 4K HDMI over IP Extender (transmitted via LAN, supports long distances).

5. Summary and recommendations

Short-distance wireless: Give priority to 60GHz wireless HDMI solutions (such as Nyrius ARIES), which take into account both image quality and low latency.
Long-distance wired: Use HDMI over Coax or fiber solutions (such as Monoprice), which are more stable.
Remote access: Consider IP encoders (such as Teradek), but the network bandwidth must be guaranteed.